Ticket #12441 (new defect) — at Initial Version

Opened 7 years ago

Last modified 6 years ago

TCP connections from host to guest drop on host network reconfiguration events.

Reported by: jglogan Owned by:
Component: network/NAT Version: VirtualBox 4.3.4
Keywords: networking Cc:
Guest type: Linux Host type: Mac OS X


I have started seeing this behavior after upgrading to 4.3.4. It is 100% repeatable on my system, and has a pretty significant impact on productivity.

The forum article I posted is

Reproduction steps: 1.) Start guest VM 2.) ssh into guest (localhost:2322 forwarded to guest:22 in my config) 3.) Perform any of the following operations:

a.) disable, then enable WiFi (issue occurs on enable, not disable) b.) disable VPN on host (happens with IPSecuritas and NetExtender VPNs on my system) c.) enable VPN on host

Expected behavior: no impact on ssh connection from host to guest

Actual behavior in 4.2.x: same as expected

Actual behavior in 4.3.4: ssh connection terminated, 'Connection to localhost closed by remote host.'


Host - MacOS 10.8.5, Guest - Ubuntu 13.04, 3.8.0-34-generic x86_64 Guest network - Paravirtualized network (NAT, natdnshostresolver enabled so that I can resolve VPN hostnames, but I have tested with it disabled and the same issue occurs) WiFi physical network connection

Change History

Changed 7 years ago by jglogan

VBox.log, network events at end of log file.

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